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Message: [QUOTE="Hotrodtractor, post: 260539, member: 25"] Setup setup setup. A 38R turbine is so small already that it isn't hard to spool - but the addition of the atmosphere will slow down the spool up of the 38R - especially if the atmosphere has a restrictive turbine wheel on it that will decrease the pressure drop across the 38R's turbine. The balance factor is what is going on with the atmosphere - while the 38R is slower - what is the atmosphere doing? Is it spooling? Is it just making a restriction making things worse? In my personal opinion - the turbine setup on these things make or breaks the setup. some very responsive setups have much larger turbine wheels than what most people can imagine. Going with some very personal experience from my past - an S475/83 is not a "race" charger IMHO its a "big" street charger- the turbine side is incredibly too small for competition use - I would rather use the 88mm at least or the 96mm turbine wheel for a race setup. I know of staged turbo setups using 96mm turbine wheels on the high pressure charger with really good spool up characteristics. Nothing I would recommend for high elevation mind you. You have posed a good question about compounds at elevation - that I suppose I need to think about some. You know that I prefer a much larger atmosphere than what you have, and I understand your concerns about spoolup.... I need to chew on this a bit. [/QUOTE]

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